CLUSTER: Support locate the same origin server when play ok.

[bjz]

Edge configuration with multiple source stations, pushing the stream to one source station, playing data from the edge, the edge pulling the stream from the source station, normal viewing. If the stream is disconnected, it causes the back-to-source to disconnect. When the client pulls the stream again, the edge goes back to the source station and finds that the edge switches the source station. Normally, it should not switch the source station if it detects that the back-to-source disconnection is caused by the client disconnection. Shouldn't it switch the source station next time it goes back to the source? Is it normal to switch the source station in a round-robin manner every time it goes back to the source?

The version used is 3.0.20

[winlinvip]

This is a problem. It is worth improving.